[Br:1][C:2]1[CH:9]=[CH:8][CH:7]=[CH:6][C:3]=1[CH2:4]O.C(N(CC)CC)C.CS(Cl)(=O)=O.[CH:22]1([NH2:25])[CH2:24][CH2:23]1>CCOCC.C1COCC1>[Br:1][C:2]1[CH:9]=[CH:8][CH:7]=[CH:6][C:3]=1[CH2:4][NH:25][CH:22]1[CH2:24][CH2:23]1To a THF solution (0.15 M) of 2-bromobenzyl alcohol (1 eq.) was added triethylamine (1.6 eq.). The reaction mixture was cooled to 0° C. before methanesulfonyl chloride (1.3 eq.) was added dropwise. The resulting solution was then allowed to warm slowly to RT. After 1.5 h, cyclopropylamine (5 eq.) was added to the now cloudy suspension. After another 18 h, the reaction mixture was diluted with ether and quenched with 1 N aq. NaOH. The organic extract was separated, washed with brine, dried over Na2SO4, filtered and the filtrate concentrated in vacuo. Purification of the crude product thus obtained by way of flash chromatography (SiO2, 4:1 (v/v) Hex:EtOAc→1:4 (v/v) Hex:EtOAc) afforded the title compound as a light yellow oil.
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